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Fire officials said they were called to the school shortly after 11 a.m. They said the spill involved grolleg lump, a silica-based product used in ceramics. It isn't clear how it got into a bathroom, but the incident is not considered suspicious.

"It's a chemical that is used by the students on a daily basis as part of their process," said Deputy Fire Chief Michael O'Brien. "It could be somewhat of an irritant, but it's not extremely hazardous to health."

A fire official said the injuries were minor skin irritations, and everyone is expected to be OK.

The section of the school where the spill took place was sealed off, and the remaining students and faculty were moved to other parts of the building.

School officials said the chemical spill posed no threat to the remaining student body and faculty, but every effort was made to follow procedure

"As soon as we became aware the chemicals had left the art department where they should have been, we took measures to move the students and to turn off the ventilation system," said Superintendent Mark Conrad.